Professor James Larkin performs a procedure where isotopes are placed into a rhino's at a rhino orphanage in the country's northern province of Limpopo, Tuesday, June 25, 2024. Researchers have started the final phase of a research project aimed at reducing rhino poaching by inserting radioisotopes into rhino horns to devalue one of the most highly trafficked wildlife commodities. (AP Photo/Denis Farrell)